Obstacle, blockage (11)
I believe the answer is:
obstruction
<span class="explanation-format__ClueExplanation">I believe this clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">obstacle</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I know that obstacle can be written as obstruction)</span><br/ ><br/ >'<span class="explanation-format__original">blockage</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I know that blockage can be written as obstruction)</span><br/ ><br/ ></span>
(Other definitions for obstruction that I've seen before include "bar" , "Blockage" , "Hindrance to progress" , "Barrier" .)